I like how the author focuses on engagement and authenticity. Too many resume writers have a Twitter profile because they think they should. Or do LinkedIn profile writing even though their profile isn't populated and they have fewer than 100 connections.

Pick a platform and OWN it. (If you don't have a preference, pick LinkedIn. Not only is it a great source for connecting with clients, but you can also connect with recruiters, learn from colleagues in LinkedIn Groups, raise your visibility online by trying LinkedIn publishing, and you've got status updates on there just like you'd have on Twitter and Facebook. So yeah, if you're going to pick one, pick LinkedIn.)